The invention relates to the technical field of plant extraction and discloses an extraction method for increasing the content of cannabidiol. The extraction method disclosed by the invention comprises the following steps: extracting industrial hemp, carrying out concentration evaporation drying on the obtained industrial hemp extract so as to enrich an ointment, and carrying out baking at 85-95 DEG C. By adopting the extraction method disclosed by the invention, the industrial hemp extract after extraction is baked at specific nodes, the content of CBD (cannabidiol) in the extract can be remarkably increased at an appropriate temperature, the THC (tetrahydrocannabinol) content is kept at a low level, which is lower than the standard of 0.3%, and a simple and effective extraction process is provided for development and utilization of the industrial hemp.